add implementation for the properties parser

add ucx2.1 style interface for a properties parser

also report coverage for header files

make loc_prev in trees optional - fixes #433

update CHANGELOG

add possibility to remove arrays of data and retrieve removed data

add cxTreeSetParent()

add functions to start iteration in a subtree

add missing details for 100% test coverage in tree.c

add test for creating an iterator over an empty tree

simplify tree class

implement cxTreeDestroyNode and cxTreeDestroySubtree - resolves #438

fix missing free() in test_array_insert_sorted

fix missing free() in test_tree_add_duplicate_root

fix uninitialized simple_destructor - fixes #443

implement cxTreeRemove() with re-link function

(0) -300 -100 -16 +16 tip

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